repulsion during the entire desodiation process. As evidenced by in situ X-ray diffraction, the NFTCM cathode shows a true zero-phase-transition behavior with a record-low volume variation of 0.062% upon cycling. This stable, zero-strain Na ions storage behavior contributes to exceptional rate capability (121 mA h/g at 10C) and remarkably stable cycling, retaining 93.7% capacity after 600 cycles. Furthermore, operando neutron diffraction data indicate that the eliminated phase transition also enables a robust oxygen framework, a crucial factor in stabilizing the ion storage process of layered oxides.
Li et al. (Wed,) studied this question.